User Manual

93
8111A–AVR–05/08
AT86RF231
8.4.5 Register Description
Register 0x07 (PHY_ED_LEVEL):
The ED_LEVEL register contains the result of an ED measurement.
• Bit [7:0] - ED_LEVEL
The minimum ED value (ED_LEVEL = 0) indicates receiver power less than or equal to
RSSI_BASE_VAL. The range is 84 dB with a resolution of 1 dB and an absolute accuracy of
±5 dB. A manual ED measurement can be initiated by a write access to the register. A value
0xFF signals that a measurement has never been started yet (reset value).
The measurement duration is 8 symbol periods (128 µs) for a data rate of 250 kb/s.
For High Data Rate Modes the automated measurement duration is reduced to 32 µs, refer to
Section 11.3 “High Data Rate Modes” on page 137. For manually initiated ED measurements in
these modes the measurement period is still 128 µs as long as the receiver is in RX_ON state.
A value other than 0xFF indicates the result of the last ED measurement.
Bit 76543210
+0x07 ED_LEVEL[7:0] ED_LEVEL
Read/WriteRRRRRRRR
Reset Value11111111